What is RSS feed, why is it so important ?

Rss-or Really simple syndication is a one-click solution that allows all of your content to be sent to your followers the moment you publish. 

The reverse is you can have each of your preferred blogs and news stories sent to you automatically without having to take the time to search all of your favourite websites. everyday for new content and updates.

Simple adding subscribe button to your blog site lets your followers click your subscribe button and instantly recieve your latest breaking blog.